A New Principle of Sound Frequency Analysis
A 1932 technical paper, A New Principle of Sound Frequency Analysis, issued through the NASA Technical Reports Server and aimed at engineers and researchers in acoustics. The pictures are laboratory photographs of electrical apparatus on a bench and oscillograph traces of sound frequencies, drawn as dark bands with bright vertical spikes and labelled peaks. A designer might borrow the dense black-and-white instrument photography and the rhythmic, graph-like striping of the frequency traces as a graphic motif.
